Pump for refrigerating apparatus



Dec. 25, 1928,

-W. H. GRAY PUMP FOR REFRIGERATING APPRATUS Filed Dec. 14, 192s Dec. 25, 179278.V

W. H. GRAY PUMP FOR REFRIGERATING APPARATUS Filed Dec. 14, 1923 2 Sheetsheet' 2 Patented l. Dec. 25, 1928.

.UNITED srATEs PATE l l 1,696,436 NTT OFFICE.

WILLIAM H. GRAY, 0F PORTLAND, OREKi-ON PUMP FOR REFRIGERATING APPARATUS'.

, y .Application filed December 14.., 1923. Serial No. 680,650.

'pumping element, and the degree of. noise v usuallyis a determiningv factor in theinstallation of a refrigerating machine 'for this kind of service. structed imp-roperl in that the operating parts are not held own by suitable bearings and they include part-s which are permitted to impact with each other andin time become loose and thus operate noisily. Another fault which I find with these machines is that they require too muchL attention.

rIhe principal object of my invention is to provide a refrigerating pump, adapted .to function, noiselessly and efficiently and with only a minimum amount of attention.

Another object of my invention is to provide means within the pump housing to separateand trap the lubricant; which in the course of the operation of the pump becomes intermiXed with the refrigerant, to prevent the latter from entering the pump mecha;- nism, where it would be harmful and tend to nullify the eect ot' the lubricant.

f I attain these objects in a refrigeratino apparatus, comprising a housing divided bby a horizontal partition into upper and lower chambers, the upper chamber constituting a sett-ling t-ank, the lower chamber constituting a lubricant receptacle, a pump cylinder opening through the wall of the lower chamber, a

piston reciprocating in said cylinder, means located in said lower chamber for reciprocating said` piston', valves controlling' the inlet and outlet ports osaid cylinder, respectively,

the out-let port of said cylinder being connect. ed by a conduit with said horizontal partitioninto said lower chamber, whereby the solid particles `carried by the refrigerant are de-v posited in said settling tank and permitted to separate therein, and the lighter lubricant is returned through said stand pipe to the pump mechanism in said lower chamber.

The, details of construction and mode of These machines are conf' inders 14 and 14a operation vof my invention are hereinafter fully described with reference to the accom-y panying drawings, in which: l

ig. 1 shows a longitudinal section of my refrigerating apparatus in which the circulation of the refrigerant is shown by arrows; Fig. 2 shows a plan view of my machine and illustrates. the direction of flow of the refrigerant through the apparatus;

Fig. 3 shows a section taken on the line 3 3 of Fig. l and illustrates further detailsy of construction;l

of F ig. l and illustrates further details of the settling tank and by arrows the direction of flow around the baii'les and ig; 5 lshows a diagrammaticv View of mechanism which is placed on the fly wheel of my device to aid the machine in starting.

Referring now to the figures my invention comprises a. pump element, 1, which is mounted on and support-ed by a closed receptacle 2 which encloses the cooling means for the gases. My pumping element 1 is made up with an integral body section 8. This body section is divided by a horizontal partition 9 into a chamber 10 which encloses the operating mechanism and a chamber 11 which com,- prises a settling tank, the chamber l1 being locatedy directly over the chamber 10 and connected only by the bore 12 in the stand pipe 13. At each side of thel casting I provide cylin which reciprocates a one piece double piston element 15 provided at Fig. 4 sho-wsa section taken on a line 4 4" in which a sliding block 18 is mounted, and

kin which is journaled an eccentric member 19 fixed to the driving shaft 20. Slot 17 is arranged vertically in the double headed piston element l5 and thus as the shaft 20 and the eccentric element 19 are rotated it will cause reciprocation of this piston element. The .shaft 20 is journaled adjacent the eccentric member 19 in the body section 8 as at 21 and I provide an extension 22 which is fasico tened to the body section 8 by means of studs Y 23 which support the shat'V 20 at its outer end by means of the cap 24.

y A fly wheel 25 is mounted on the end of this shaft but isjournaled to rotate freely thereon and a ratchet element 26, as shown more clearly in Fig. 5, is provided keyed to the shaft 20 b means of the key 27. I provide arms 28 w Aich are pivotally connected to the liy wheel 25, as at 29 and 29H1 A.bese arms are provided with counter Weights 30 and the tion as shown in dotted lines and thus`disengages the same from the ratchet. I provide an electric motor 34, which is mounted on the chamber 2 andV is provided with a pulley 35 which is alined with the Hy wheel 25. This pulley is connected to the fly wheel by means of a belt 36. As before mentioned, the fly wheel is normally disconnected from the shaft 20 and thus when the motor is started, it does not have to overcome the inertial of the moving parts` of the machine and the Hy wheel, but only has to drive the Hy wheel until sufficient centrifugal force is created by its speed to cause the weights 30 to be swung outwardly which will engage the pawl with the tooth 26a and thus the pump will be driven but without jerking or straining as it starts.

The reciprocation of the piston in the pump interposes a different resistance to the driving element in its different positions and the recess 26b is provided so that if the Hy wheel lags behind the driving shaft due to the re-expansion of the refrigerant in the pump,

it is prevented from doing so by the pawl 32 engaged therein.

I provide valve heads 37 and 372L on the L end of each cylinder, the valve head 37 being `ing held on on the end of the cylinder 14 and the valve head 37l being on the cylinder 14a. These valve heads have inlet valves 38 and exhaust valves 39. The inlet valve being held in place by a coil spring 40 which acts against the removable nut 41 and the exhaust valves 39 betheir seats by means of the coil spring 42 which acts againstk the removable nut 43. Each o f these valves is provided with suitable tapered seats. The inlet valves 38 work in the valve chambers 44, 44 respectively, and the exhaust valves work inthe valve chamber' 45, 45 respectively. The exhaustvalve chambers 45 are connected to the pipe 46 by means of a header `or pipe 47 which serves both ends of the pump and is connected to a pipe 48 which passes the gases into f the chamber 11, the lower part of which constitutes the settling tank.

This chamber is provided with a. number of V-shaped ba-Hle plates 49 and a number of inclined baffles 50 (see Fig. 4) which co-operate therewith. Thus as the compressed refrig'erant is passed into this chamber it has to pass circuitously therethrough and if there is any lubricating o-il or anyJ refrigerant which is liquefied it willv be dropped in the bottom of this chamber and only the`gaseous refrigerant will pass on and to the pipe 51 into the coolingcoils 3 in the housing'2. The refrigerant whichl preferably use is sulphur dioxide. Liquid ,sulphur dioxide has a spe-` cific gravity of 1.5 and the lubricating' oil which I use has approximately a specific gravity of .8 5. These two liquids do not intermix in the least and thus it can be seen that the lubricating oil will rest on top of the liquid sulphur dioxide. The stand-pipeC 13 projects up into the chamber 11 suliiciently to permit excess oil to be floated up to the to chlzimber 10 but is too high to permit the liquid sulphur dioxide to overflow through the stand pipe and into the pump. The heatof the pump soon causes the su phur dioxide and through theopening 12 back into the in the chamber 11 tovaporize and pass out` I through the opening 51 as previorsly described with the gasA which ispassing therethrough. The cooling coils 3 cause the refrigerant in the 'va `orized form to liquefy nol in that it decreases t e temperature and thus the liquid refrigerant is passed out in the bottom ofthe coils through the pipe 52 where a portion passes to the expansion valve 7 which controls the water supply, the remainder then passing into the expansion valve 4 through the pipe 53.

The refrigerant then passes throu h the pipe 7 3 to the Hat refrigerating coils 4 and 77 which I have called pan cake coils and from there-to the coils 79 and in this the pipe is formed into the form of a hollow cylinder from the outside towards the center and the pipe is then led from the central coil, as 80, to a supplementary settling tank 6 from whence the refrigerant is returned to the pump through the pipe 87.

I claim:

1. Ina refrigerating apparatus, a circucylinder being connected by a conduit 'with said upper chamber, a stand pipe carried by and extendingy through said horizontal partition into said lower chamber, whereby the solid particles carried by the refrigerant are deposited in said settling tank and permitted to separate therein, and the lighter 'lubricant is returned through said stand pipe to the pump mechanism in said lower chamber.

2. In a refrigerating apparatus, a circulation pump element comprisingk a housing f divided by a horizontal partition into upper and lower chambers, the upper chamber constituting a settling tank, thelower chamber constituting a lubricant receptacle, a pump cylinder o ening through the Wall of the lower cham er, a piston reciprocating'in said cylinder, means located in saidvlower chamber for reciprocating said piston, Valves controlling the inlet and outlet ports of said cylinder, respectively, the outlet port of said cylinder being connected by a conduit with said upper chamber, a stand pipe carried by and extending through said horizontal partition into said lower chamber, baliles carried on the roof of said upper chamber, whereby the solid particles carried by the refrigerant are deposited in said settling tank and permitted to separate therein, and the lighter lubricant is returned through said stand pipe tothe pump mechanism in said lower chamber, WILLIAM H. GRAY; 

